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Table of Contents
Note: This API call is for DOS and Win16 personality only. Use Family API for portability.
Int 21H, AH=46H
Version
2 and higher
Brief
“DUP2”, “FORCEDUP” - FORCE DUPLICATE FILE HANDLE
Family API
Input
AH = 46h BX = file handle CX = file handle to become duplicate of first handle
Return
CF clear if successful
CF set on error AX = error code (04h,06h) (see #01680 at AH=59h/BX=0000h)
Notes
closes file with handle CX if it is still open DOS 3.30 hangs if BX=CX on entry moving file pointer for either handle will also move it for the other, because both will refer to the same system file table
See also
AH=3Dh,AH=45h
Note
Text based on Ralf Brown Interrupt List Release 61
osFree Macro Library | |
---|---|
Video I/O | @SetMode @SetCurSz @SetCurPos @GetCur @SetPage @ScrollUp @ScrollDn @Scroll @GetChAtr @PutChAtr @PutCh @SetPalet @SetColor @SetDot @GetDot @WrtTTY @VideoState @GetMode @GetDisplay @GetVideoState @GetEGAInfo @Cls |
Hardware info | @Equipment @MemSize |
Serial I/O | @AuxInit @AuxSendChar @AuxRecieveChar @AuxStatus |
Tape I/O | @TapeOn @TapeOff @TapeRead @TapeWrite |
Keyboard I/O | @KbdStatus @CharIn @CharPeek |
Printer I/O | @PrnPrint @PrnInit @PrnStatus |
Disk I/O | @DskReset @DskStatus @DskRead @DskWrite @DskVerify @DskFormat |
Date and Time | @SetTime @GetTime |
Mouse | @MouInit @MouShowPointer @MouStatus @MouSetPos @MouSetMickey @MouRegion |
Memory manager | @ModBlok SET_BLOCK |